S-98164A526 5/16"-18 x 1 1/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty load-bearing applications
- Precision thread engagement through Class 3A thread fit and UNC coarse threading, ensuring reliable fastening in high-vibration settings
- Optimized installation efficiency with 3/16" hex drive and rounded button head design, enabling quick assembly with standard tools
- Full-length threading provides consistent grip along the entire 1-1/8" length, maximizing connection integrity
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications
- Enhanced durability through right-hand coarse thread spacing, resisting loosening under dynamic loads
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 316 stainless steel rounded head screws deliver critical corrosion resistance where exposure to chemicals, saltwater, or extreme temperatures would compromise ordinary fasteners. The combination of Class 3A thread fit with UNC coarse threading ensures rapid installation and vibration resistance in machinery, structural assemblies, and processing equipment. The passivated finish creates an additional protective oxide layer, significantly extending service life in aggressive environments. With 70,000 psi tensile strength and fully threaded design, these hex drive screws maintain clamping force under sustained loads, making them ideal for heavy-duty fastening in manufacturing, marine, and chemical processing applications where reliability is non-negotiable.
Specification Summary & Compliance
This 5/16"-18 UNC screw features precision Class 3A thread fit with coarse thread spacing and full threading along its 1-1/8" length. Manufactured to ASME B18.3 specifications with 316 stainless steel material and passivated finish. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance adherence for global industrial distribution.
